/Engine/Source/Editor/ViewportInteraction/Public/ViewportWorldInteraction.h
Starts dragging selected objects around. Called when clicking and dragging on actors/gizmos in the world, or when placing new objects.
void StartDragging ( [UViewportInteractor](API\Editor\ViewportInteraction\UViewportInteractor) * Interactor, [UActorComponent](API\Runtime\Engine\Components\UActorComponent) * ClickedTransformGizmoComponent, const FVector & HitLocation, const bool bIsPlacingNewObjects, const bool bAllowInterpolationWhenPlacing, const bool bShouldUseLaserImpactDrag, const bool bStartTransaction, const bool bWithGrabberSphere )